191 entries under tough topic. ×

13
grim(adjective, strong, hard, severe)
12
intractable(adjective, firm, persistent, obstinate)
12
mulish(adjective, mean, strong, hard)
12
steely(adjective, strong, hard, firm)
11
incompliant(adjective, severe, firm, resist)
11
scrupulous(adjective, good, hard, complete)
10
flinty(adjective, strong, hard, severe)
9
stiff-necked(adjective, mean, strong, hard)
9
close(adjective, hard, correct, severe)
9
punctilious(adjective, close, hard, correct)
9
puritanical(adjective, correct, moderate, severe)
9
stuffy(adjective, correct, moderate, severe)
8
hardheaded(adjective, strong, hard, determined)
8
pertinacious(adjective, determined, resolute, obstinate)
8
single-minded(adjective, severe, firm, harsh)
7
cruel(adjective, strong, hard, severe)
7
dour(adjective, hard, severe, firm)
7
hard-line(adjective, strong, hard, severe)
7
pigheaded(adjective, mean, hard, firm)
7
prudish(adjective, correct, severe, firm)
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APASmart Define. (2015). rigid thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/rigid/thesaurus/synonyms
ChicagoSmart Define. 2015. "rigid thesaurus" https://smartdefine.org/rigid/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, rigid thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/rigid/thesaurus/synonyms>.
MLASmart Define. "rigid thesaurus" 3 August 2015. Web. 28 September 2026. <https://smartdefine.org/rigid/thesaurus/synonyms>